【1111】 转换成10进制 是2的3次方加2的2次方加2的1次方加2的0次方等于15，因为2的冥次方是从0开始的。
如果在您的情况下不起作用，那么其他事情就会出错。 (这是其他评论家已经告诉你的。)
我怎么能说服你呢？
我最后的(绝望)尝试：一个(不那么)MCVE：
#include
#include
int main()
{
QString samples[] = {
"0x0", "0x1", "0x1e", "0x11", "0x1111", "0x111e", "0x111f"
};
enum { n = sizeof samples/sizeof *samples };
for (int i = 0; i < n; ++i) {
const QString &hexString = samples[i];
qDebug() << "Formatted binary output of " << hexString;
for (int j = 1; j < 40; j += 8) {
bool ok;
qDebug()
<< QString("%1: %2")
.arg(j, 2)
.arg(hexString.toULongLong(&ok, 16), j, 2, QChar('0'));
}
}
// done
return 0;
}
编译和测试：
Formatted binary output of "0x0"
" 1: 0"
" 9: 000000000"
"17: 00000000000000000"
"25: 0000000000000000000000000"
"33: 000000000000000000000000000000000"
Formatted binary output of "0x1"
" 1: 1"
" 9: 000000001"
"17: 00000000000000001"
"25: 0000000000000000000000001"
"33: 000000000000000000000000000000001"
Formatted binary output of "0x1e"
" 1: 11110"
" 9: 000011110"
"17: 00000000000011110"
"25: 0000000000000000000011110"
"33: 000000000000000000000000000011110"
Formatted binary output of "0x11"
" 1: 10001"
" 9: 000010001"
"17: 00000000000010001"
"25: 0000000000000000000010001"
"33: 000000000000000000000000000010001"
Formatted binary output of "0x1111"
" 1: 1000100010001"
" 9: 1000100010001"
"17: 00001000100010001"
"25: 0000000000001000100010001"
"33: 000000000000000000001000100010001"
Formatted binary output of "0x111e"
" 1: 1000100011110"
" 9: 1000100011110"
"17: 00001000100011110"
"25: 0000000000001000100011110"
"33: 000000000000000000001000100011110"
Formatted binary output of "0x111f"
" 1: 1000100011111"
" 9: 1000100011111"
"17: 00001000100011111"
"25: 0000000000001000100011111"
"33: 000000000000000000001000100011111"
注：
冒号前(:)数量提供使用的字段宽度。
示例输出显示如果使用字段宽度提供的数字量不能正确显示结果数字，则输出可能会变长。
这与文档中描述的完全相同。 (由我强调)：
fieldWidth指定一个被填充到
key="1111"; //把2进制字符串key，转成10进制keys keys = Integer.parseInt(key, 2);//数字2代表进制，可以是各种进制，转换成10进制 System.out.println(keys ); //把10进制keys转成16进制result，toUpperCase()是把小写字母转换成大写字母 result= Integer.toHexString(keys).toUpperCase(); System.out.println(result);
1 key="1111"; 2 //把2进制字符串key，转成10进制keys 3 keys = Integer.parseInt(key, 2);//数字2代表进制，可以是各种进制，转换成10进制 4 System.out.println(keys ); 5 //把10进制keys转成16进制result，toUpperCase()是把小写字母转换成大写字母 6 result= Integer.toHexString(keys).toUpperCase(); 7 System.out.println(result);
转载于:https://www.cnblogs.com/mengweihong/p/11305006.html
